Liquid detector



FIG. 1 is a front, top and side perspective view of the liquid detector embodying the design of the present invention;

FIG. 2 is an elevational elevational view thereof, all elevational views being identical;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a bottom perspective view thereof. 

The ornamental design for a liquid detector, as shown and described. 